Here are some examples:
* "He had a donnish air about him, always correcting people's grammar."
* "The book was filled with donnish footnotes and obscure references."
The word "donnish" can also be used to describe something that is uninterestingly academic or theoretical, rather than practical or relevant.
For instance, you might say:
* "The lecture was so donnish that I couldn't stay awake."
Overall, "donnish" is a word that evokes a sense of intellectualism, but it can also be used to describe someone who is overly pedantic or detached from the real world.